Projective Measurement Scheme for Solid-State Qubits

Details Projective Measurement Scheme for Solid-State Qubits Projective Measurement Scheme for Solid-State Qubits

2003-10-13

arxiv.org/abs/quant-ph/0310083v1

Phys. Rev. B 67, 220505(R) (2003)

Physics

Quantum Physics

published, PRB 67, R220505 (2003)

Scientific paper

10.1103/PhysRevB.67.220505

We present an effective measurement scheme for the solid-state qubits that does {\bf not} introduce extra decoherence to the qubits until the measurement is switched on by a resonant pulse. The resonant pulse then maximally entangles the qubit with the detector. The scheme has the feature of being projective, noiseless, and switchable. This method is illustrated on the superconducting persistent-current qubit, but can be applied to the measurement of a wide variety of solid-state qubits, the {\bf direct} detection of the electromagnetic signals of which gives poor resolution of the qubit states.

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